[MacPorts] #72451: base: support --with-git=${git_prefix}

[MacPorts]

#72451: base: support --with-git=${git_prefix}
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 Reporter:  barracuda156  |      Owner:  (none)
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.10.7
 Keywords:                |       Port:
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 configure allows to use a lot of external binaries, but not `git` for some
 reason. However, MacPorts uses `git` as one of port fetch types. System
 `git` may not exist (< 10.7) or may not be usable (< 10.9), and it is
 undesirable to be required to activate `git` port every time git is needed
 for something (that pulls a lot of dependencies). Like with `curl`, `git`
 can be built in a separate MacPorts tree, so that the main installation
 can use it instead of its own port.

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Ticket URL: <https://trac.macports.org/ticket/72451>
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